package org.apache.maven.cli.logging;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;
import java.util.Properties;

import org.codehaus.plexus.util.PropertyUtils;
import org.slf4j.ILoggerFactory;

/**
 * Slf4jConfiguration factory, loading implementations from
 * <code>META-INF/maven/slf4j-configuration.properties</code> configuration files in class loader:
 * key is the class name of the ILoggerFactory, value is the class name of the corresponding
 * Slf4jConfiguration.
 *
 * @author Hervé Boutemy
 * @since 3.1.0
 */
public class Slf4jConfigurationFactory {
  public static final String RESOURCE = "META-INF/maven/slf4j-configuration.properties";

  public static Slf4jConfiguration getConfiguration(ILoggerFactory loggerFactory) {
    try {
      Enumeration<URL> resources = Slf4jConfigurationFactory.class.getClassLoader().getResources(RESOURCE);

      String key = loggerFactory.getClass().getCanonicalName();

      while (resources.hasMoreElements()) {
        URL resource = resources.nextElement();

        Properties conf = PropertyUtils.loadProperties(resource.openStream());

        String impl = conf.getProperty(key);

        if (impl != null) {
          return (Slf4jConfiguration) Class.forName(impl).newInstance();
        }
      }
    } catch (IOException e) {
      e.printStackTrace();
    } catch (InstantiationException e) {
      e.printStackTrace();
    } catch (IllegalAccessException e) {
      e.printStackTrace();
    } catch (ClassNotFoundException e) {
      e.printStackTrace();
    }

    return new BaseSlf4jConfiguration();
  }
}
